It's a MOD that was created originally for CTF.
What it does is the following

-Gives you the baseJKA game flow and damages
-Gives a few JA+ moves like the controlled yellow dfa
-Allows for unlimited number of admins with individual passwords
-An RCON tool that will allow you to close off glitches...litterally, I could create invisible stairs on say desert map in siege, so the Jedi could run up and attack the snippers and no one would know how. What this does for the game is allows responsible admins to patch holes in the game so that people can't take advantage of a hole or glitch
-Allows for a more customized gaming experience.
-gives ammo speed variables (unneeded)
-gives ammo shot amount variables *55 lazers instead of 1 in a single shot* (kinda dumb)
-gives transparent flags during CTF
-gives out awards as you play (you heal your team enough you get the team healer award)
-keeps track of statistics (if selected)
-improved scoreboard in CTF and slightly in siege I believe.
-client side plugins available
-having the program isn't necessary, but it doesn't hurt
-base maps are glitch free when using XMOD

Downsides
-commands are far different than JA+
-can't ban without an rcon bypass =\
-animation can become screwy in siege or CTF if you don't die..litterally you won't see how your player moves except slight twists...doesn't help anyone.
-The developer is not expected to update anytime soon if at all